IMO,
this system is pretty weak, i am replacing sensors left and right. i had one machine last winter, it was only one year old with 600 sep hrs, none of the sensors worked.
i thought, "there is no way that all 3 sensors could be bad on this new of a machine" so i started checking wiring, i had high resistance in one of the sensor wires, checked the wire all the way back to the controller and wire was good, wire out of controller to ground was good, so logic, and service advisor, would say that it was the controller. i swapped with another machine of the same vintage, and same problem. got ahold of DTAC. it didn't seem to much of an issue that i had this high resistance, they simply said to replace all 3 sensors.
replaced all the sensors, problem solved.
sorry for the rant, but when i have problems here, first check harness, next replace sensors.